Axis substitution help please

[McLaren]

Good morning everyone, I am having problems wrapping an engraving on a cylinder and was hoping someone could help me out.

 

I have a 4th axis(aligned with "X") with a 9.9" diameter cylinder on it. My datum is the right edge in "X", centered in "Y", and the top of the part is "Z".

 

I have text at X-7.875 Y1.1 Z0. On the tool parameter page I have the rotary box checked with "Axis Substitution", "Substitute Y Axis", "CW" and 9.9" diameter.

 

The problem is since my axis rotates on Z0 when I backplot the engraving is happening 4.95" above the part. How do I change the rotation so it happens based on Z-4.95"?

 

Thanks in advance for any and all replies.

 

edit: Forgot to mention 9.1 MR0304

[crazy^millman]

Sorry but it is doing what it suppose to be doing. You want Z0 to be the center of the rotary any other way is just going to be problems. Get yourself use to doing 4 axis work this way and life will be so easy when programming in Mastercam and doing 4th axis work.

 

If you would like an explanation I will be glad to give you one.

 

HTH

[jmfrank]

I allways program with part Z0 to center of rotation not top of part. Not sure how you can get where your trying to go from where your at.

 

Matt

[DavidB]

As above have said the Z and Y origin needs to be the rotation point of that axis.

You can either move your geom so Z zero is centre of the diameter, or create a WCS with the origin in the centre of the diameter (Z and Y)and on the edge in X you like.

 

HTH

[Santa Fe]

Your rotary settings are fine. Go to the contour parameter page and set all to incremental. MC knows that top of the cylinder is at 4.95 on Z if you are programing from center of the diameter.

[Santa Fe]

Sorry answer to fast, as crazymillman said, you need Z0 to be the center of rotation.

 

The other way to do it with Z at top of stock will be surface finish project and use curves for projection type but only if you are not engraiving all around the cylinder.

 

Sorry.

[crazy^millman]

McLaren did this help you out???

[McLaren]

Ack~! Sorry for not responding guys, I keep forgetting email notification doesn't happen automatically. Thanks for all of the replies though. It was a one time deal so to make it work I just did a search and replace of all of the Z values to -.015" from 4.935".

 

I'm going to check into the incremental suggestion though.